Rule.



H. GASSTROM.

RULE.

APPLICATION FILED DEC.22,1909.

Patented Dec. 13,1910.

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RULE. APPLICATION FILED DEO. 22, 1909.

' Patented Dec. 13, 1910.

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i Il lll/l ,Il l l UNITED sTATEs PATENT oEFIoE.

` HERMAN GASSTROM, OF NEW YORK, N. Y., ASSIGNOR TO DAHL MANUFACTURING bemeasured. Thereupon,

COMPANY, 0F NEW YORK, N.

A CORPORATION OF NEW YORK.

RULE.

Specification of Letters Patent. Patented Dec 13 1910. Application filedDecember 22, 1909. Serial No. 534,461.

'lo all whom it may concern.'

Be it knownV that I, HERMA): GAssTnoM, a subject of the Czar of Russla,residmg at New York city, in the borough of Man-v hattan, county andState of New York, have invented certain new and useful Improve- `mentsin Rules, of which the following is a clear, full, Iand exactdescription.

This invention relates to extending foot rules. A

The object of the invention is primarily to secure a rule which may beextended between two given points, and a direct reading of the measureddistance got from the rule. It also refers to particular improvementsinrconstruction of a rule of such description.

In carrying out the invention `I make use of terminal sections, and aplurality of intermediate sections, all of the same length, and slidingone upon another. The sections may be so marked on one side that whenthe rule is fully extended it will a pear as an ordinary rule so far asthe reading is concerned, while its reversed side is so scaled that onemay readily read and directly read the distance which ,the rule has beenextended. To secure this result, one terminal end, preferably the leftend, is marked with 'inch or other marksequal to its length, for

instance, for a four inch length, while the `until the butt end or lefthand end of the rule touches the other side of the object to by readingat the right hand end' of the section or sections last extended, adirect reading of the rule may be secured.

The scope of this invention ed out in the claim.

In the accompanying drawings: Figure 1 is a plan View of one form ofrule constructed in accordance w'ith my invention, showing it marked asan ordinary rule. Fig. 2 is a reversed view of the same rule, marked asherein described. Fig. 3 is a lan view of the' rule as used in measuringetween 0bwill be pointjects. Fig. 4 is a side elevation of Fig. 3. Fig.5 is a plan of one side of a modified form of rule. Fig. 6 is a plan ofthe same when partially collapsed between two abutments.v Fig. 7 is aside elevation of Fig. G. Fig. 8 is a detailed section on line 8-8 Fig.7. Fig. 9 is n perspective view ofthe end clamp and guide piece.

In the drawings, Figs. 1 to 4, I have shown one form of my-im roved-rule. It consists of a -left hand terminal section 4, a right handterminal section 1,` and two intermediate sections 2 and In `thislinstance, each section is four inches long. lThe sides of each sectionare provided with sur'-l face grooves 7, and overlapping fingers 5 ofsliding clamps secured at the endl of 'each intermediate section areprovided to engage therewith. Stops 6 preferably of metal, are alsoprovided, against "which the sliding clamps 5 may abut when the rule isextended. The rule is marked on one side in' this instance, as it is afour-inch 1ulcso as to measure 1, 2, 3 and et on the left hand section,and 5, 6 on the right hand section,be ing in each instance the sum ofthe extended section. The intermediate sections are successivelynumbered from the right hand section. As a result of this marking, whenthe rule is extended as shown in Figs. 3 and 4, the distance between theabutments 8 and 9 to be measured will appear at the end of the lastmembers extended. shown, sections 4 and 3 lie superposed, and at theirright hand end onel may be able to In the examples length of the rule inthat position. In the example shown in Fig. 3, such distancev would ybeSi inches.

As shown in Figs. 5 to 9, in order to provide a rule'which, when closed,will have both of its ends secure and incapable of being openedfan-wise, I provide each end of the intermediate sections and each innerend of the extreme sections with a clamp 50 secured to-the face of therule by prongs 70, jammed therein by any suitable instrument. This clamphas an extended part provided with inturned guide pieces 60 engaginggrooves .101 in the edges of the adjoining sections, and slidingtherein. A guide 60, when pulled to the extreme length of the rule, willstrike against the guide 60 of the adjoining. rule section at theopposite end,

which will act'as a stop. The rule of this struction of the-clamp andguide. It also'V secures the advantage of preventing one end of the rulefrom being openedIfan-wise.

This rulejs composed of sections 10, 20, and 40, and it may measure thedistancebetween abutments 8O and 90 as shown. Its scale is .marked in asimilar'manner to that shown inFigsl preferably provided in slot 101 ofthe section 40 for the purpose; of limiting the extreme flimit of therule "shown to one foot.

In carrying outA this invention, details of construction may be variedfrom those shown, and yet the essence of the invention be retained; someparts might be employed without others, and new features thereof1 mightbecombined with elements old in the art in diverse ways, although theherein described type is regarded as embodying substant-ial improvementsover such modifications.

' As many changes could be made in the above construction, and many aparently widely dierent embodiments of t e invention could be madewithout'ldeparting from the scope thereof, it is intended that allmatter contained in the above description or shown inthe accompanyingVdrawings shall -be interpreted in an illustrative and not in alimitingV sense. It is furthermore desired to be understood that thelanguage to 4. A stop pin 100 isused in the following claim is intendedto cover all the generic and specific features of the invention hereindescribed, and allstatements of the scope of the invention which as -amatter of language might be said to fall therebetween.

I claim as my invention: The herein described sliding rule composed ofend sections, a plurality of intermediate sections, each section of,flat lengths superposed one on the other, each sect-ion:

sliding upon the adjoining section 'in agg@ straight line, each sectionof the same length, marking for said rule consisting of the followingdivisions one terminalsection marked at the end division with numeralsequal to the length of the other terminal section plus the position suchnumerals oc cupy on the marked section, from the end, the intermediatesliding sectionsv being marked consecutively to the said marked terminalsection, ywhereby a direct reading can be secured uponthe marked sectionor the intermediate sections from the end of the last section which isslid longitudinally, grooves at the sides of the sections, metal endpieces, secured to the sections, having turned ends engaging saidgrooves in the adjoining section.

Signedv at New December 1909.

` HERMAN GASSTROM.

York city this 21st day of Witnesses:

F. WARREN WRIGHT, y BENJAMIN O. KSENKRUG.

